#!/usr/bin/env bash
# This is a shebang interpreter for launching emacs lisp scripts with Doom's CLI
# framework preloaded and all the metadata it needs initialized. Use it like so:
#
#   #!/usr/bin/env doomscript
#   (print! "Hello world!")
#
# For this to work, this file must be in your $PATH.
#
#   export PATH="$HOME/.emacs.d/bin:$PATH"
#
# This can also be exploited to evaluate arbitrary elisp against Doom's CLI
# environment.
#
# This isn't used for bin/doom because of the $PATH requirement (and using
# $BASH_SOURCE to locate it would reduce its POSIX compliance). This shouldn't
# be an issue for folks writing their own CLIs, however.

set -e
case "$EMACS" in
    *term*) EMACS=emacs ;;
    *) EMACS="${EMACS:-emacs}" ;;
esac

TMPDIR="${TMPDIR:-$($EMACS -Q --batch --eval '(princ (temporary-file-directory))' 2>/dev/null)}"
if [ -z "$TMPDIR" ]; then
    >&2 echo "Error: failed to run Emacs with command '$EMACS'"
    >&2 echo
    >&2 echo "Are you sure Emacs is installed and in your \$PATH?"
    exit 1
fi

export EMACSDIR="${EMACSDIR:-$(cd $(dirname "$BASH_SOURCE")/.. && pwd)}"
export __DOOMPID="${__DOOMPID:-$$}"
export __DOOMSTEP="$((__DOOMSTEP+1))"
export __DOOMGEOM="${__DOOMGEOM:-`tput cols lines 2>/dev/null`}"
export __DOOMGPIPE=${__DOOMGPIPE:-$__DOOMPIPE}
export __DOOMPIPE=; [ -t 0 ] || __DOOMPIPE+=0; [ -t 1 ] || __DOOMPIPE+=1

tmpfile="$TMPDIR/doomscript.${__DOOMPID}"

target="$1"
shift
$EMACS -Q --batch \
    --load "$EMACSDIR/core/core-cli" \
    --load "$target" \
    -- "$@" || exit=$?
# Execute exit-script, if requested (to simulate execve)
if [ "${exit:-0}" -eq 254 ]; then
    sh "${tmpdir}/doom.${__DOOMPID}.${__DOOMSTEP}.sh" "$0" "$@" && true
    exit="$?"
fi
exit $exit